Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre
To enable an accurate estimate of total excess nitrogen (N) in the North Atlantic, a new tracer TNxs is defined, which includes the contribution of organic nutrients to the assessment of N:P stoichiometric anomalies. We measured the spatial distribution of TNxs within the subtropical North Atlantic...
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ftdoajarticles:oai:doaj.org/article:9c4c5ee21b614838a993f653aa50e853 2023-05-15T17:27:49+02:00 Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre A. Landolfi A. Oschlies R. Sanders 2008-09-01T00:00:00Z https://doaj.org/article/9c4c5ee21b614838a993f653aa50e853 EN eng Copernicus Publications http://www.biogeosciences.net/5/1199/2008/bg-5-1199-2008.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 https://doaj.org/article/9c4c5ee21b614838a993f653aa50e853 Biogeosciences, Vol 5, Iss 5, Pp 1199-1213 (2008) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2008 ftdoajarticles 2022-12-31T09:08:38Z To enable an accurate estimate of total excess nitrogen (N) in the North Atlantic, a new tracer TNxs is defined, which includes the contribution of organic nutrients to the assessment of N:P stoichiometric anomalies. We measured the spatial distribution of TNxs within the subtropical North Atlantic using data from a trans-Atlantic section across 24.5° N occupied in 2004. We then employ three different approaches to infer rates of total excess nitrogen accumulation using pCFC-12 derived ventilation ages (a TNxs vertical integration, a one end-member and a two-end member mixing model). Despite some variability among the different methods the dissolved organic nutrient fraction always contributes to about half of the TNxs accumulation, which is in the order of 9.38±4.18×10 11 mol N y −1 . We suggest that neglecting organic nutrients in stoichiometric balances of the marine N and P inventories can lead to systematic errors when estimating deviations of nitrogen excess or deficit relative to the Redfield ratio in the oceans. For the North Atlantic the inclusion of the organic fraction to the excess nitrogen pool leads to an upward revision of the N supply by N 2 fixation to 10.2±6.9×10 11 mol N y −1 . Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 A. Landolfi A. Oschlies R. Sanders Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
To enable an accurate estimate of total excess nitrogen (N) in the North Atlantic, a new tracer TNxs is defined, which includes the contribution of organic nutrients to the assessment of N:P stoichiometric anomalies. We measured the spatial distribution of TNxs within the subtropical North Atlantic using data from a trans-Atlantic section across 24.5° N occupied in 2004. We then employ three different approaches to infer rates of total excess nitrogen accumulation using pCFC-12 derived ventilation ages (a TNxs vertical integration, a one end-member and a two-end member mixing model). Despite some variability among the different methods the dissolved organic nutrient fraction always contributes to about half of the TNxs accumulation, which is in the order of 9.38±4.18×10 11 mol N y −1 . We suggest that neglecting organic nutrients in stoichiometric balances of the marine N and P inventories can lead to systematic errors when estimating deviations of nitrogen excess or deficit relative to the Redfield ratio in the oceans. For the North Atlantic the inclusion of the organic fraction to the excess nitrogen pool leads to an upward revision of the N supply by N 2 fixation to 10.2±6.9×10 11 mol N y −1 . |
format |
Article in Journal/Newspaper |
author |
A. Landolfi A. Oschlies R. Sanders |
author_facet |
A. Landolfi A. Oschlies R. Sanders |
author_sort |
A. Landolfi |
title |
Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
title_short |
Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
title_full |
Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
title_fullStr |
Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
title_full_unstemmed |
Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
title_sort |
organic nutrients and excess nitrogen in the north atlantic subtropical gyre |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
https://doaj.org/article/9c4c5ee21b614838a993f653aa50e853 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Biogeosciences, Vol 5, Iss 5, Pp 1199-1213 (2008) |
op_relation |
http://www.biogeosciences.net/5/1199/2008/bg-5-1199-2008.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 https://doaj.org/article/9c4c5ee21b614838a993f653aa50e853 |
_version_ |
1766120116623245312 |